I’m an idiot and did some testing as well. Here’s the numbers I got for every weapon type (note that this is on a level 72 Sorcerer, which isn’t ideal but I realized that halfway through and wasn’t going to change, I’ve noted the amount of bases available at level 72 of each type; this shouldn’t effect the 1H Sword/Blunt however). https://imgur.com/a/LZPOGl3
It does seem to me that 1H Blunt maybe overrepresented (and others over and under) but this is a pretty small sample size all told, so it’s hard to say for sure.
IF There were an actual disparity though, I’d hazard a guess it might be due to the fact that all 1H Swords have the same type of implicit (Damage), but 1H Blunts have 3 kinds (Stun Chance, Melee Stun Chance, and Physical Damage).
Thanks for finding this. It turns out it is a bug and one handed blunt weapons have double the chance of other weapons. This will be fixed in the next patch.